Wabco 973-0-01-0180 Trailer Pneumatic Control Valve Unit

Module Feature

973-0-01-0180 is a pneumatic trailer control valve manufactured by Wabco. It is a core component of trailer compressed air brake system, distributes air pressure signal from tractor side to trailer brake chambers. It realizes service brake proportional control and emergency brake trigger when supply air loss occurs. Built-in pressure protection and anti-surge structure, compatible with ABS trailer brake system. Widely stocked as spare for heavy truck, semi-trailer and commercial vehicle brake repair.

Working principle

Control air signal from tractor brake valve enters the control port of this valve. Internal piston and spool assembly convert control signal pressure into proportional output pressure for trailer brake actuators. If main supply air line breaks or leaks, internal spring mechanism triggers emergency brake automatically to stop trailer. Pressure check valve maintains residual pressure for safe standby.

Onboard components

Pneumatic spool valve assembly, pressure sensing piston, emergency spring, check valve, sealing diaphragm, multiple air ports and cast aluminium valve body.

LED indicators

No built-in LED indicator.

Hardware self‑diagnosis

Function judged by air pressure test, no electronic self-check. Brake response pressure can be verified by pressure gauge.

Programming software

Not applicable, pure pneumatic mechanical valve, no configuration software required.

Electrical & Process Parameters

Model: 973-0-01-0180 Brand: Wabco Device type: Trailer pneumatic brake control valve Working medium: Compressed air Function: Trailer service brake proportional regulation and emergency brake protection

Mechanical & Structure

Mounting: Bracket bolt mounting on trailer chassis Protection class: IP65 Housing: Cast aluminium body with rubber seals

Environmental

Operating temperature: -40℃ ~ +80℃ Storage temperature: -45℃ ~ +90℃ Ambient humidity: 5~95% non‑condensing

Certification: CE, E-MARK vehicle approval Status: Original Wabco vehicle pneumatic spare

Installation

Depressurize the whole air brake system before replacement. Mount valve on chassis bracket, connect supply, control and brake output air pipes according to port marking, perform air tightness test and brake response test after commissioning.

Interface

Supply air port, control signal port, brake output port, exhaust port.

Diagnostic

Slow brake response: Internal spool stuck or air pipe blocked. Emergency brake always triggered: Supply air circuit leakage. Air leakage: Diaphragm damage or thread seal failure.

Product Brief

973-0-01-0180 valve, Wabco trailer air brake control spare for heavy semi-trailer pneumatic brake system replacement.